Hello Dimi,

1. I am not sure if it can be done without the use of extensions, but if you are okay with installing one, Tab Mix Plus gives you the option to hide the tab bar when you only have 1 tab (in addition to many other options). Under the Tab Mix Plus options after installing, the option to hide it will be under Display > Tab Bar. Another one after a quick search is conveniently titled Hide Tab Bar with One Tab.
2. The title bar can be removed by clicking followed by Customize. At the bottom of the page that opens should say "Title Bar" (will be beside "Show/hide Toolbars), if you click that the Title bar will disappear and be merged with the Menu Bar.
3. I am not sure if the address bar can be moved anymore, but if you still have your Bookmarks Toolbar, that can be placed beside the menu options to give you more space. Go to the same page as in step 2, then click and drag the bookmarks toolbar onto the same toolbar as the menu bar.

Hope that helps.

Hi CoryMH,

Thank you very much. Got some space.

Remaining question is still how to move the adress bar to the menu bar without using CTR.

Best Dimi

PS: I am a really wondering why they did remove this possibility. Now I have Australis - which I do not like anyway - less possibilties and lost a lot of time.

Why don't you not show the Menu Bar and then use the Alt key to reveal the Menu Bar when you need to see it.

As far as your PS - Mobile is the new horizon. Australis UI was designed primarily for cell phones and tablets (the future), and so that Mozilla didn't have to maintain two different sets of code, the desktop / laptop / netbook got got it, too. Screen orientation between the two "classes" of devices differs by 90 degrees - widescreen vs tall screen, and the "wide" came out on the "short end".

Hi the-edmeister,

Thank you for the hint. I will try this out (but it seems less comfortable).

I appreciate any improvement and the consideration of mobile devices. But why did you skip the possibility to move the adress bar to the menu bar? Nobody with a tall screen device would be forced to do so.

Best, Dimi

Problem finally solved. To overcome the limitations of the newer Firefox versions I disabled all addons and enabled them one by one checking whether they cause problems.

For instance, I used Classic Theme Restorer to get vertical space. But it causes problems if used together with SettingSanity which I used to get the javascript button back (a Firefox bug not fixed since version 23!). So I switched to another tool (Toolbar Buttons). And so on.

Best wishes, Dimi

PS: If I had known how many hours it takes to get the functionality of previous Firefox versions back I had never done this udate. But I have learned my lesson (no Firefox updates anymore)